Ответ:

  1. \(\sqrt{50}-\sqrt{18}+\sqrt{8}=5\sqrt{2}-3\sqrt{2}+2\sqrt{2}=4\sqrt{2}\).
  2. \(\sqrt{75}-\sqrt{12}=5\sqrt{3}-2\sqrt{3}=3\sqrt{3}\).
  3. \(\sqrt{88}:\sqrt{2}=\sqrt{44}=2\sqrt{11}\).
  4. \((\sqrt{3}+\sqrt{2})(\sqrt{3}-\sqrt{2})=3-2=1\), по формуле разности квадратов.
  5. \(\sqrt{16\cdot5}-\sqrt{45}=4\sqrt{5}-3\sqrt{5}=\sqrt{5}\).